[Feature] (load) Support load binlog from MySQL directly

[MorningLight5]

Proposed changes

Issue Number: close #8025

Problem Summary:

Checklist(Required)

1. Does it affect the original behavior: (No)
2. Has unit tests been added: (Yes)
3. Has document been added or modified: (Yes)
4. Does it need to update dependencies: (Yes)
5. Are there any changes that cannot be rolled back: (No)

Further comments

[morningman]

Hi @tianhui5 , thanks for your contribution.
This is good feature, I suggest to create a DSIP for it: https://cwiki.apache.org/confluence/display/DORIS/Doris+Improvement+Proposals

[weizuo93]

It's better to add some documents to describe the usage of this feature. Thank you!

[github-actions]

We're closing this PR because it hasn't been updated in a while.
This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
If you'd like to revive this PR, please reopen it and feel free a maintainer to remove the Stale tag!